docs: Fix conflicting contributor identity info

In commit d4563201f33a ("Documentation: simplify and clarify DCO
contribution example language"), the patch submission documentation was
updated to remove the note about pseudonyms and instead simplify it to
allow "known identities".

The process documentation still explicitly prohibits pseudonymous
contributors. This patch changes the process documentation to line up
with the submitting patches document.

Signed-off-by: Ammar Askar <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/process/1.Intro.rst

···
 foreseeable future.
 
 It is imperative that all code contributed to the kernel be legitimately
-free software.  For that reason, code from anonymous (or pseudonymous)
-contributors will not be accepted.  All contributors are required to "sign
-off" on their code, stating that the code can be distributed with the
-kernel under the GPL.  Code which has not been licensed as free software by
-its owner, or which risks creating copyright-related problems for the
-kernel (such as code which derives from reverse-engineering efforts lacking
+free software.  For that reason, code from contributors without a known
+identity or anonymous contributors will not be accepted. All contributors are
+required to "sign off" on their code, stating that the code can be distributed
+with the kernel under the GPL.  Code which has not been licensed as free
+software by its owner, or which risks creating copyright-related problems for
+the kernel (such as code which derives from reverse-engineering efforts lacking
 proper safeguards) cannot be contributed.
 
 Questions about copyright-related issues are common on Linux development